Re: 88 T-Bird Crankcase Breather
You removed the crankcase breather & replaced it with a pcv valve? You can't do that, it will create a vacuum in the crankcase.
I'm betting you already had a pcv valve
According to Autozone;
On your 1988 Ford Thunderbird (2.3L FI Turbo), the PCV Valve is located:
Under hood, center, upper engine area, driver side of engine, between engine block and intake manifold, mounted in vacuum hose